Update agent.py

Author: KinonoChen

libs/agno/agno/agent/agent.py

@@ -3567,7 +3567,7 @@ def get_relevant_docs_from_knowledge(
         # Use knowledge base search
         #If use LangChainKnowledgeBase, then we no need to check if the vector_db is None because we have LangChainKnowledgeBase's retriever
         try:
-            if self.knowledge is None or (self.knowledge.vector_db is None and self.knowledge.retriever is None):
+            if (self.knowledge is None or (self.knowledge.vector_db is None and getattr(self.knowledge, "retriever", None) is None)):
                 return None
 
             if num_documents is None:
@@ -3631,7 +3631,7 @@ async def aget_relevant_docs_from_knowledge(
         # Use knowledge base search
         #If use LangChainKnowledgeBase, then we no need to check if the vector_db is None because we have LangChainKnowledgeBase's retriever
         try:
-            if self.knowledge is None or (self.knowledge.vector_db is None and self.knowledge.retriever is None):
+            if (self.knowledge is None or (self.knowledge.vector_db is None and getattr(self.knowledge, "retriever", None) is None)):
                 return None
 
             if num_documents is None: